Pushpa Ithal may not fit the stereotype of the typical Silicon Valley CEO — she's female, foreign-born, and a mother. Nevertheless, Ithal is an entrepreneur, living the Silicon Valley dream of running her own startup. Like her, many foreign-born tech women are finding a place in the Valley — as tech companies have become more and more dependent on foreign-born workers to create their products and services. Silicon Valley, the global center for high-tech innovation, could be renamed "Immigrant Valley." When it comes to technical talent, the engine of Silicon Valley is fueled by foreign-born workers, many of whom are from humble roots. And having worked hard to get here, many have ambitions beyond their day jobs. One of them is Ithal. On Sundays, she and her two children, ages…